Phosphorus-31 nuclear magnetic resonance spectra of platinum complexes containing nonequivalent phosphorus atoms and the cis-influence

Abstract

A number of platinum complexes [PtCl₂(R₃P)L] and [PtCl(R₃P)₂L]Cl, where L is a phosphine or phosphite ligand, have been prepared and their ³¹P n.m.r. spectra are reported. It is suggested that these data provide evidence which supports the existence of a cis-influence. Use of ³¹P–{¹H} double resonance enables |²J(P–Pt–P)| to be measured directly. trans-[PtCl₂(Buⁿ₃P)(Et₃P)] does not give a first-order ³¹P n.m.r. spectrum.